<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<style>
  * {
    margin: 0;
    padding: 0;
  }

  body {
    width: 100vw;
    height: 100vh;
    background-color: #000;
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .main {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    background-image: linear-gradient(0deg, rgb(47, 102, 255), rgb(161, 79, 255) 30%, rgb(238, 55, 255) 60%, rgb(255, 0, 76) 100%);
    position: relative;
  }

  .main:before {
    content: '';
    position: absolute;
    width: 200px;
    height: 200px;
    border-radius: 50%;
    background-image: linear-gradient(0deg, rgb(47, 102, 255), rgb(161, 79, 255) 30%, rgb(238, 55, 255) 60%, rgb(255, 0, 76) 100%);
    filter: blur(30px);
    animation: rotate .4s linear infinite;
  }

  .main::after {
    content: 'rotate';
    text-align: center;
    line-height: 150px;
    font-weight: bold;
    color: #fff;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 150px;
    height: 150px;
    border-radius: 50%;
    background-color: #000;
  }

  @keyframes rotate {
    0% {
      transform: rotate(0deg);
    }

    100% {
      transform: rotate(360deg);
    }
  }

  .box {}
</style>

<body>
  <div class="main">
  </div>
</body>

</html>